Improved mode of making and venting cores for castings



J. HARRISDN, Jr. MODE 0F MAKING MHWBNTING.Y coms PoR GASTINGS.

No. 49,264. Patented Aug. 8, 1865.

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UNITED ,STATES PATENT OFFICE.

JOSEPH HARRISON, JR.,'OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED MODE OFMAKING AND VENTING CORES FOR CASTINGS.

Specification forming part of Letters Patent No. 49,264, dated August 8, 1&165.

To'al whom it 'may concern Bc it known that I, JOSEPH HARRisoN, Jr., of the city of Philadelphia and State of Pennsylvania, have invented a new and Improved Method of Venting Cores or Molds to be used in the Castingof Iron or other Metal, and to enable others skilled in the art to make and use the same, I do declare that the following is a full and exact description, to wit:

The nature of my invention consists in forming cores of moist sand or other material for pipes or other castings in the usual manner, on a perforated tube or other form of any desired length or shape. said tube or other form to have certain attachments, hereinalter to be described, so that the effect of a vacuum may be availed of to strengthen the core at the momentofcasting, and at the same time to rapidly take away from the core the gases ,generated by the molten metal, thus preventing the tendency lo blowing or making imperfect work.

Thedrawingshowsapertorated tube adapted to casting a pipe made upot' a series ot' spheres, upon which is formed the core, (colored yellow.) By any of the ordinary means one or both ends of the tube may be attached to an air-pump or to a vacumnchamber placed at a convenient distance from the mold. When the castingis to be poured the air-pump is to be first started, or the connection opened with the vacuum, and as the metal rises` under and around the core the gases that are generated by the heat ofthe metal from the material ot' which the core is made will be conveyed by the effect of the vacuum into the tube and thence discharged by the air-pump or` made to occupy the empty space inthe vacuumchamber, milch more et'- l'ectually venting the core than when the gases are taken ott' in the ordinary manner, while at the same time, in consequence of the partial vacuum which takes place throughout the whole length of the core, the sand forming the core is relieved ofthe pressure at or near its center, the pressure of the atmosphere being against its external surface, and the whole core ing is the result.

I also intend to apply the saine inode ol'venting and strengthening molds or other forms made ot'sand or other material for the purpose of making castings, where such molds or forms might not be properly called cores.

I am aware that a patent has been granted to Jillian Bernard from the British Patent Ol'- tice, under date April'25, 1853, No. 995, for a method ot' exhausting molds for molten metal or plastic materials-such as gutta-percha and the like-hy mea-ns ofa vacuum forthepurpose of obtaining a more correct product from the mold; but it will be seen on reference to the specication ot' said Bernard., and comparing it with the above description ot' my invention, that the two methods have entirely different aims. In the case of Bernard I infer` that his molds are made ot metal or other solid material, and his` whole object is to exhaust the cavity ofthe mold by means ot'a vacuum while the plastic material is being run into the cavity. In `my case I make no el'ort to exhaust the cavity ot' the mold, but leave it, in the usual manner, open to the external air. My cores or molds are made of porous moist sand, or similar material, and my object is to convey away by means ot' a vacuum the gases that are always generated in such material as my cores or molds are made ot' whenever molten metal is run into the cavity ot' the mold.

What I claim as my invention, and desire to secure byA Letters Patent, is-

The mode ot' making, using, and venting cores or molds for castings, as above described, for the purpose of strengthening them when made ot' Weak, moist'sand or similar material, and for the better venting the same by availing of a vacuum, as above described, when the molten metal is poured into the molds.

JOSEPH HARRISON, JR.

Witnesses WM. POULTERN, W. H. HARRISON. 

